// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_BASE_NETWORK_CONFIG_WATCHER_MAC_H_
#define NET_BASE_NETWORK_CONFIG_WATCHER_MAC_H_

#include <SystemConfiguration/SCDynamicStore.h>

#include <memory>

#include "base/mac/scoped_cftyperef.h"
#include "base/macros.h"

namespace base {
class Thread;
}

namespace net {

// Helper class for watching the Mac OS system network settings.
class NetworkConfigWatcherMac {
public:
    // NOTE: The lifetime of Delegate is expected to exceed the lifetime of
    // NetworkConfigWatcherMac.
    class Delegate {
    public:
        virtual ~Delegate() { }

        // Called to let the delegate do any setup work the must be run on the
        // notifier thread immediately after it starts.
        virtual void Init() { }

        // Called to start receiving notifications from the SCNetworkReachability
        // API.
        // Will be called on the notifier thread.
        virtual void StartReachabilityNotifications() = 0;

        // Called to register the notification keys on |store|.
        // Implementors are expected to call SCDynamicStoreSetNotificationKeys().
        // Will be called on the notifier thread.
        virtual void SetDynamicStoreNotificationKeys(SCDynamicStoreRef store) = 0;

        // Called when one of the notification keys has changed.
        // Will be called on the notifier thread.
        virtual void OnNetworkConfigChange(CFArrayRef changed_keys) = 0;
    };

    explicit NetworkConfigWatcherMac(Delegate* delegate);
    ~NetworkConfigWatcherMac();

private:
    // The thread used to listen for notifications.  This relays the notification
    // to the registered observers without posting back to the thread the object
    // was created on.
    std::unique_ptr<base::Thread> notifier_thread_;

    DISALLOW_COPY_AND_ASSIGN(NetworkConfigWatcherMac);
};

} // namespace net

#endif // NET_BASE_NETWORK_CONFIG_WATCHER_MAC_H_
